Appendix Figure. Two general approaches to regionalization. With minimum volume standards, patients currently at hospitals below a specified procedure volume threshold (very-low-volume hospitals) are "redistributed" to hospitals above the threshold. With designated referral centers, all patients are directed to selected (high-volume) hospitals.

Appendix Figure. Two general approaches to regionalization. With minimum volume standards, patients currently at hospitals below a specified procedure volume threshold (very-low-volume hospitals) are "redistributed" to hospitals above the threshold. With designated referral centers, all patients are directed to selected (high-volume) hospitals.